Yamaha CR-840 Owner's Manual page 13

CONNECTING THE LOOP ANTE IVIN
Connect the cord from the loop antenna to the
ANTENNA AM and GND terminals on the rear
panel of the receiver. If the combination bar is not
removed, best reception will not be obtained.
Note: Always be sure to remove the combination bar
when connecting the loop antenna.
Always be sure to remove the loop antenna
_when using the combination bar._
Fig. 9
USING THE LOOP ANTENNA
Adjust the direction of the loop antenna for best
reception as shown in the Fig. 10.
Since the AM broadcast frequency band is a low
500 kHz ~ 1,600 kHz, its wavelength is approxi¬
mately 300m at 1,000 kHz and the use of a long
antenna is ideal for noise-free reception. However,
an FM antenna is actually used as an AM antenna
and AM broadcasts are received at an extremely
low input level.
Therefore, satisfactory reception may be impossi¬
ble where AM receiving conditions are poor (such
Conditions and Symptoms when receiving AM broadcasts with the Loop Antenna
Receiving Conditions
- What antenna are you using in what room?
Symptom
— What are the receiving conditions of
the AM broadcast you want to receive?
Room
Antenna
Inside Building
T-type FM antenna AM broadcasts cannot be received.
Inside Building and near
Noise sources. &
T-type FM antenna
Very Noisy (Signal meter pointer
deflects only slightly.)
Not inside Building, but near
Noise sources. %
T-type FM antenna
(with lead wire extension)
Very Noisy (Signal meter pointer
deflects only slightly.)
In a room near a power line. T-type FM antenna
Modulation hum is loud.
Near a high tension line. Outdoor antenna or Community
antenna
Broadcast station signal is
strong, but antenna is near
indoor wiring and Noise
sources. &
T-type FM antenna, Outdoor
antenna, or Community antenna Interference.
as inside a building and near fluorescent lamps,
thermostats, motors, or discharge lamps).
Use this loop antenna by referring to the following
table.
This loop antenna is designed to be used vertically.
If used otherwise, its reception sensitivity reduce
expensively. So, please do not fail to use it verti¬
cally all the time.
^ Noise sources: Fluorescent lamps, thermostats, motors, discharge lamps, and other electrical devices.
* Under the conditions except the above figure, use the combination bar.